Re: upgrade kvm with running vm

[Michael Tokarev <mjt@tls.msk.ru>]

09.10.2010 03:36, Teck Choon Giam wrote:
> On Fri, Oct 8, 2010 at 2:03 PM, Michael Tokarev <mjt@tls.msk.ru> wrote:
[]
> I am not sure about userspace wise.  In order to use different version
> of qemu-kvm, besides reboot... there is only one method to run
> different version such as upgraded version or downgraded version... is
> to shutdown all VMs and reload the kvm related kernel modules.

Someone of us two does not understand something.

Why are you reloading kernel module?  It comes with the kernel,
and if you reloading it, you're rebooting the host, no?  If yes,
why?

[]
>> Do Not Mess With Kernel Modules (tm).  There's no need to.

It was for a reason I mentioned this.  Again: kvm, for quite
some time already, does not come with kernel modules, the
kernel modules comes with your kernel.  You need 2.6.28+
kernel modules to work with any reasonable kvm userspace,
including even kvm-72 from debian lenny.  Earlier kernels
are hopeless for kvm, there were too many various problems
exposed by kvm (this includes debian 2.6.26 kernel).

There's no need to mess with kvm kernel modules.  Unless
you want to use some feature that is present only in some
future release (such as vhost-net for example).  But for
these, it may be better to really upgrate the kernel to
2.6.35+.

/mjt